Valcour Island, Lake Champlain, "Middle Chazy Limestone" (Ordovician of the United States)

Where: Clinton County, New York (44.6° N, 73.4° W: paleocoordinates 28.1° S, 54.8° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Crown Point Formation (Chazy Group), Chazyan (470.0 - 457.3 Ma)

• " Middle Chazy limestone [...] " (Flower, 1952 p. 54). This may be in the Crown Point Fm. but is does not have to. The beds of the middle part of the Chazy gp. are Marmor to Ashby in age according to Kapp & Stearn (1975, J. Paleont. 49(1)).

•"dove coloured limestone" Ruedemann (1906)

• group of beds-level stratigraphic resolution

Environment/lithology: limestone

Size classes: macrofossils, mesofossils

Preservation: cast

Reposited in the USNM

Primary reference: R. H. Flower. 1952. New Ordovician Cephalopods from Eastern North America. Journal of Paleontology 26(1):24-59 [B. Kröger/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89105: authorized by Björn Kröger, entered by Torsten Liebrecht on 05.05.2009, edited by Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Orthocerida - Proteoceratidae
"Spyroceras clintoni" = Stereospyroceras clintoni Miller 1877
Cyrtactinoceras boycii Whitfield 1886
 Orthocerida - Orthoceratidae
Orthoceras modestum Ruedemann 1906
Orthoceras progressum Ruedemann 1906
Orthoceras vagum Ruedemann 1906
Orthoceras lentum Ruedemann 1906
 Tarphycerida - Tarphyceratidae
 Oncocerida - Oonoceratidae
Ooceras perkinsi Ruedemann 1906
 Oncocerida - Valcouroceratidae
Valcouroceras elongatum n. sp. Flower 1952
holotype: USNM, no catalogue number given